The predominant colour associated with Mark Master Masonry is often described as sky-blue. This colour signifies the transition from innocence to knowledge, as it represents the blue of the sky breaking through the whiteness of innocence. As one progresses through the higher degrees, more colours and beauty are introduced, symbolizing the deeper understanding and enlightenment gained through Masonic teachings.
Bro. Wilmshurst elaborates that the pale sky-blue of the rosettes on the Fellow Craft apron and the blue lining and edging of the Mark Master Mason's apron indicate this transition. He notes that these colours symbolize the seven great divisions or varieties of life, represented by the seven colours of the spectrum, which are also reflected in the tassels of the aprons worn in these degrees .